Trouble Spots in a Basic Air Conditioning Unit

• Refrigerant Leakage: Commonly occurs at the compressor shaft seal, condenser, dryer, oil separator, evaporator coils, or damaged pipes.
• Condenser: Insufficient water or air flow and dirty tubes may cause high-pressure (HP) trip.
• Filters: Blocked intake and recirculation filters lead to poor airflow.
• Dryer & Expansion Valve: Can experience icing or short cycling, causing system inefficiencies.
• Evaporator Coil: Dirt accumulation leads to poor heat transfer and icing.
• Electrical Problems: Malfunctioning of LP/HP trips, oil differential pressure switches, thermostats, solenoid valves, motors, or fans.
• V-Belts: Wear and breakage can disrupt fan or motor operation.
• Expansion Valve Malfunction: Leads to improper cooling.
• Compressor Issues: Damage due to liquid refrigerant entering the suction line or inadequate lubrication.

De-Humidification Process:

• The air is overcooled first to reduce its temperature below the dew point, causing the excess moisture to condense out of the air.
• The cooled, dry air is then reheated to bring it back to a comfortable temperature and humidity level suitable for human comfort.
• This ensures the air supplied to the space is not excessively humid.

Humidity Control Through Humidification:

• A humidifier is fitted inside the Air Handling Unit (AHU).
• The humidifier injects steam or water mist into the heated air to maintain a relative humidity of approximately 40%, which is considered comfortable.
• This ensures that the heated air does not cause dryness in the indoor environment, improving comfort for occupants.